umm.. i don;t use p5 all that often (i use pp), but from what you've said, it sounds like you open a pre-saved file, then apply your mat pose, if you don't save the pz3 file with the new stuff you have added to it, the next time you open it it, it will still be blank. I'm also wondering why you are appling a mat pose that way? A mat pose is usually applied from the pose library with a simple click of the mouse. A mat pose is a file that apllies an entire texture with all the correct setting, i didn't think you could do that in the material room... perhaps you mean a texture file. anyhoo... i suspect someone with more experience of p5 can help you more.

My Gallery